In vitro fatigue tests and in silico finite element analysis of dental implants with different fixture/abutment joint types using computer-aided design models

Satoshi Yamaguchi, Yasufumi Yamanishi, Lucas S. Machado, Shuji Matsumoto, Nick Tovar, Paulo Coelho, Van P. Thompson, Satoshi Imazato

Research output: Contribution to journalArticle

Abstract

Purpose: The aim of this study was to evaluate fatigue resistance of dental fixtures with two different fixture-abutment connections by in vitro fatigue testing and in silico three-dimensional finite element analysis (3D FEA) using original computer-aided design (CAD) models. Methods: Dental implant fixtures with external connection (EX) or internal connection (IN) abutments were fabricated from original CAD models using grade IV titanium and step-stress accelerated life testing was performed. Fatigue cycles and loads were assessed by Weibull analysis, and fatigue cracking was observed by micro-computed tomography and a stereomicroscope with high dynamic range software. Using the same CAD models, displacement vectors of implant components were also analyzed by 3D FEA. Angles of the fractured line occurring at fixture platforms in vitro and of displacement vectors corresponding to the fractured line in silico were compared by two-way ANOVA. Results: Fatigue testing showed significantly greater reliability for IN than EX (p< 0.001). Fatigue crack initiation was primarily observed at implant fixture platforms. FEA demonstrated that crack lines of both implant systems in vitro were observed in the same direction as displacement vectors of the implant fixtures in silico. Conclusions: In silico displacement vectors in the implant fixture are insightful for geometric development of dental implants to reduce complex interactions leading to fatigue failure.

Original languageEnglish (US)
JournalJournal of Prosthodontic Research
DOIs
StateAccepted/In press - Oct 27 2016

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Computer-Aided Design
Finite Element Analysis
Dental Implants
Computer Simulation
Fatigue
Joints
In Vitro Techniques
Titanium
Psychological Stress
Analysis of Variance
Tooth
Software
Tomography

Keywords

  • Bioengineering
  • Dental implant-abutment design
  • Fatigue test
  • Finite element analysis
  • Step-stress accelerated life tests

ASJC Scopus subject areas

  • Oral Surgery
  • Dentistry (miscellaneous)

Cite this

In vitro fatigue tests and in silico finite element analysis of dental implants with different fixture/abutment joint types using computer-aided design models. / Yamaguchi, Satoshi; Yamanishi, Yasufumi; Machado, Lucas S.; Matsumoto, Shuji; Tovar, Nick; Coelho, Paulo; Thompson, Van P.; Imazato, Satoshi.

In: Journal of Prosthodontic Research, 27.10.2016.

Research output: Contribution to journalArticle

Yamaguchi, Satoshi ; Yamanishi, Yasufumi ; Machado, Lucas S. ; Matsumoto, Shuji ; Tovar, Nick ; Coelho, Paulo ; Thompson, Van P. ; Imazato, Satoshi. / In vitro fatigue tests and in silico finite element analysis of dental implants with different fixture/abutment joint types using computer-aided design models. In: Journal of Prosthodontic Research. 2016.
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